CN103175580B - Measuring method and measuring device for capacitance type pore plate flow quantity of conducting liquid - Google Patents
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Abstract
本发明公开了一种导电液体的电容式孔板流量测量方法及装置。置于测量管内部的金属孔板和套在绝缘测量管外部的金属环组成集总电容，此集总电容的容量与通过绝缘测量管导电液体的流量成函数关系，通过对此集总电容容量的测量，得出当前通过绝缘测量管导电液体的流量值。该装置的振荡驱动电路依次经电容式孔板传感器、微小电容测量电路、放大器、整流滤波电路、跟随器、430单片机与输出显示电路连接。本发明不需要差压测量装置，因而避免了差压法孔板流量计会由于液体泄漏、隔膜材料弹性性能的改变、工艺流体的腐蚀性影响等原因而出错的问题，而且电容式孔板流量测量方法结构简单、成本低、功耗少。
The invention discloses a capacitive orifice flow measuring method and device for conductive liquid. The metal orifice plate placed inside the measuring tube and the metal ring set outside the insulating measuring tube form a lumped capacitance. The capacity of this lumped capacitor is a function of the flow of conductive liquid through the insulating measuring tube. The measurement can obtain the current flow value of the conductive liquid passing through the insulating measuring tube. The oscillating driving circuit of the device is connected with the output display circuit sequentially via a capacitive orifice sensor, a microcapacitance measuring circuit, an amplifier, a rectifying and filtering circuit, a follower, and a 430 single-chip microcomputer. The present invention does not require a differential pressure measuring device, thereby avoiding the problem that the differential pressure method orifice flowmeter will cause errors due to liquid leakage, changes in the elastic properties of the diaphragm material, and the corrosive influence of the process fluid. The measuring method has the advantages of simple structure, low cost and low power consumption.
Description
技术领域 technical field
本发明涉及一种流量测量方法及装置，尤其是涉及一种导电液体的电容式孔板流量测量方法及装置。 The invention relates to a flow measurement method and device, in particular to a capacitive orifice flow measurement method and device for conductive liquid.
背景技术 Background technique
在目前的流量技术中，人们已经可以利用导电液体的各种效应来测量液体流量，用于导电液体流量测量的方法和仪表的种类繁多。品种如此之多的原因在于至今还没有找到一种对任何流体、任何量程、任何流动状态以及任何使用条件都适用的流量仪表。每种产品都有它特定的适用性，也都有它的局限性。涡流式、科里奥利式等流量计虽然精确度较高，但是这类流量计价格也较高昂。而其它典型的流量计如孔板式、细腰管式、喷口式、电磁式等，同样有着很好的精度，能够满足测量需要，且有着结构简单、成本较低的特点，因而这些类型的流量计仍然常常为人们所使用。 In the current flow technology, people can already use various effects of conductive liquid to measure liquid flow, and there are various methods and instruments for flow measurement of conductive liquid. The reason why there are so many varieties is that a kind of flow meter that is applicable to any fluid, any range, any flow state and any use condition has not been found so far. Each product has its specific suitability, as well as its limitations. Although flowmeters such as vortex type and Coriolis type have high accuracy, the price of such flowmeters is relatively high. Other typical flowmeters, such as orifice plate type, thin waist tube type, spout type, electromagnetic type, etc., also have good accuracy, can meet the measurement needs, and have the characteristics of simple structure and low cost. Therefore, these types of flow meters Meters are still commonly used by people.
差压法孔板流量计，主要利用流体通过锐孔的节流作用，使流速增大，压强减小，造成孔板前后形成压强差，将这个压强差作为测量的依据。差压法孔板流量计因为其设计简单、成本较低，所以被广泛应用。但是这种带差压测量装置的流量计会由于液体泄漏、隔膜材料弹性性能的改变、工艺流体的腐蚀性影响等原因而出错，使测量结果不可靠。 The differential pressure method orifice plate flowmeter mainly uses the throttling effect of the fluid passing through the orifice to increase the flow rate and reduce the pressure, resulting in a pressure difference between the front and back of the orifice plate, which is used as the basis for measurement. The differential pressure orifice flowmeter is widely used because of its simple design and low cost. However, such a flowmeter with a differential pressure measurement device may make errors due to liquid leakage, changes in the elastic properties of the diaphragm material, corrosive effects of the process fluid, etc., making the measurement results unreliable.
发明内容 Contents of the invention
为了克服差压法孔板流量计因带有差压测量装置而带来的上述问题，本发明的目的在于提供一种导电液体的电容式孔板流量测量方法及装置，不需要差压测量装置，而且结构简单、成本低、功耗少。 In order to overcome the above-mentioned problems caused by the differential pressure orifice flowmeter with a differential pressure measuring device, the purpose of the present invention is to provide a capacitive orifice flow measuring method and device for conductive liquids, which do not require a differential pressure measuring device , and has simple structure, low cost and low power consumption.
本发明所采用的技术方案是： The technical scheme adopted in the present invention is:
一、一种导电液体的电容式孔板流量测量方法： 1. A capacitive orifice flow measurement method for conductive liquids:
采用置于绝缘测量管内部的金属孔板和套在绝缘测量管的金属环组成一个集总电容；当导电液体流经管道中的金属孔板时，由于金属孔板的节流作用，使导电液体流速增大，当导电液体流量大小不同时，经过金属孔板后导电液体的发散程度不同，因而金属孔板与金属环之间的电介质随流量大小变化而变化，由金属孔板和金属环组成的集总电容容量大小也就随流量大小变化而变化，那么，所形成的集总电容的容量大小是通过绝缘测量管的导电液体的流量的函数；即：Cx=Cx(q)，通过对此集总电容进行测量，进而得出导电液体流量的大小。 The metal orifice plate placed inside the insulating measuring tube and the metal ring sleeved on the insulating measuring tube are used to form a lumped capacitor; when the conductive liquid flows through the metal orifice plate in the pipeline, due to the throttling effect of the metal orifice plate, the conduction When the flow rate of the liquid increases, when the flow rate of the conductive liquid is different, the degree of divergence of the conductive liquid after passing through the metal orifice plate is different, so the dielectric between the metal orifice plate and the metal ring changes with the flow rate. The size of the aggregated capacitance of the composition also changes with the flow rate. Then, the capacity of the formed lumped capacitance is a function of the flow rate of the conductive liquid passing through the insulating measuring tube; that is: C x =C x (q) , by measuring this lumped capacitance, the flow rate of the conductive liquid can be obtained.
二、一种导电液体的电容式孔板流量测量装置： 2. A capacitive orifice plate flow measuring device for conductive liquid:
本发明包括转换器和电容式孔板传感器；其中： The invention includes a transducer and a capacitive orifice sensor; wherein:
转换器，包括振荡驱动电路、微小电容测量电路、放大器、整流滤波电路、跟随器、430单片机和输出显示电路；振荡驱动电路依次经电容式孔板传感器、放大器、整流滤波电路、跟随器、430单片机与输出显示电路连接； Converter, including oscillation driving circuit, tiny capacitance measuring circuit, amplifier, rectification and filtering circuit, follower, 430 single-chip microcomputer and output display circuit; The single chip microcomputer is connected with the output display circuit;
电容式孔板传感器，包括绝缘测量管、金属孔板和金属环；金属孔板放置在绝缘测量管内，绝缘测量管外套有金属环，金属孔板和金属环组成集总电容Cx，集总电容Cx的一极接振荡驱动电路LM741的第6脚进行激励，另一极接微小电容测量电路，绝缘测量管的两端面分别用法兰通过各自的绝缘垫片或聚四氯乙烯塑胶片与系统管道相连接。 Capacitive orifice sensor, including insulating measuring tube, metal orifice plate and metal ring; the metal orifice plate is placed in the insulating measuring tube, the insulating measuring tube is covered with a metal ring, the metal orifice plate and the metal ring form a lumped capacitance C x , the lumped One pole of the capacitor C x is connected to the 6th pin of the oscillating drive circuit LM741 for excitation, and the other pole is connected to the micro-capacitance measurement circuit. System piping is connected.
所述的金属孔板用不锈钢螺钉垂直固定在绝缘测量管中，朝向导电液体出口端方向的金属孔板中心孔边缘为由小变大的锥形孔，绝缘测量管和金属孔板之间用阿拉代胶密封，不锈钢螺钉为集总电容Cx的一个电极，从不锈钢螺钉上引出一根导线。 The metal orifice plate is vertically fixed in the insulating measuring tube with stainless steel screws, and the edge of the center hole of the metal orifice plate towards the outlet end of the conductive liquid is a tapered hole that changes from small to large. Sealed with arabic glue, the stainless steel screw is an electrode of the lumped capacitor Cx , and a wire is drawn from the stainless steel screw.
所述的金属环位于金属孔板后的导电液体出口端方向，金属环套在绝缘测量管外，金属环横截面与绝缘测量管轴线垂直，金属环为集总电容Cx的另一电极，从金属环上引出一根导线。 The metal ring is located in the direction of the outlet end of the conductive liquid behind the metal orifice plate, the metal ring is sleeved outside the insulating measuring tube, the cross section of the metal ring is perpendicular to the axis of the insulating measuring tube, and the metal ring is another electrode of the lumped capacitance Cx, from A wire emerges from the metal ring.
所述的振荡驱动电路，以放大器LM741为核心，放大器LM741的第6脚输出端经电容式孔板传感器与低功耗放大器LM124的第三路运算放大器OP07-3的第9脚相接。 The described oscillating driving circuit uses the amplifier LM741 as the core, and the 6th pin output terminal of the amplifier LM741 is connected with the 9th pin of the third operational amplifier OP07-3 of the low power consumption amplifier LM124 through a capacitive orifice sensor.
所述的微小电容测量电路，以低功耗放大器LM124的第三路运算放大器OP07-3为核心，采用交流激励法，第三路运算放大器OP07-3的第9脚经电容式孔板传感器与放大器LM741的第6脚相接，电阻R9和电容C6并联两端分别接到OP07-3的第9脚和第8脚，第三路运算放大器OP07-3的第8脚与放大器INA101的第10脚相接，第三路运算放大器OP07-3的第10脚接地。 The microcapacitance measurement circuit is based on the third operational amplifier OP07-3 of the low-power amplifier LM124, and adopts the AC excitation method. The ninth pin of the third operational amplifier OP07-3 is connected to The 6th pin of the amplifier LM741 is connected, the resistor R9 and the capacitor C6 are connected in parallel to the 9th pin and the 8th pin of the OP07-3 respectively, the 8th pin of the third operational amplifier OP07-3 is connected to the 10th pin of the amplifier INA101 The pins are connected, and the 10th pin of the third operational amplifier OP07-3 is grounded.
所述的放大器与整流滤波电路，整流滤波电路以低功耗放大器LM124的第一路运算放大器OP07-1为核心，第一路运算放大器OP07-1的第3脚与放大器INA101的第8脚相接，第一路运算放大器OP07-1的第1脚与第二路运算放大器OP07-2的第5脚相接。 The amplifier and the rectification filter circuit, the rectification filter circuit is based on the first operational amplifier OP07-1 of the low-power amplifier LM124, and the third pin of the first operational amplifier OP07-1 is in phase with the eighth pin of the amplifier INA101 Connect, the 1st pin of the first operational amplifier OP07-1 is connected with the 5th pin of the second operational amplifier OP07-2.
所述的跟随器，以低功耗放大器LM124的第二路运算放大器OP07-2为核心，第二路运算放大器OP07-2的第5脚与第二路运算放大器OP07-2的第1脚相接，第二路运算放大器OP07-2OP07-2的第7脚与430单片机相接，再通过输出显示电路显示输出测量结果。 The follower is based on the second operational amplifier OP07-2 of the low-power amplifier LM124, and the fifth pin of the second operational amplifier OP07-2 is in phase with the first pin of the second operational amplifier OP07-2. Then, the 7th pin of the second operational amplifier OP07-2OP07-2 is connected with the 430 single-chip microcomputer, and then the output measurement result is displayed through the output display circuit.
所述的430单片机，采用msp430f5438，输出显示电路采用12864点阵带汉字液晶模块，低功耗放大器LM124是有四路运算放大器OP07的集成芯片。 The 430 single-chip microcomputer adopts msp430f5438, the output display circuit adopts a 12864 dot matrix liquid crystal module with Chinese characters, and the low-power amplifier LM124 is an integrated chip with four operational amplifiers OP07.
本发明具有的有益效果是： The beneficial effect that the present invention has is:
本发明采用电容式孔板流量测量方法，它不需要差压测量装置，因而避免了差压法孔板流量计会由于液体泄漏、隔膜材料弹性性能的改变、工艺流体的腐蚀性影响等原因而出错的问题，而且电容式孔板流量测量方法结构简单、成本低、功耗少。 The present invention adopts the capacitive orifice flow measurement method, which does not require a differential pressure measurement device, thereby avoiding the failure of the differential pressure method orifice flowmeter due to liquid leakage, changes in the elastic properties of the diaphragm material, and corrosive effects of the process fluid. The problem of error, and the capacitive orifice flow measurement method has simple structure, low cost and low power consumption.
附图说明 Description of drawings
图1是本发明电容式孔板流量测量传感器结构图。 Fig. 1 is a structural diagram of a capacitive orifice flow measuring sensor of the present invention.
图2是本发明电容式孔板流量测量装置结构原理框图。 Fig. 2 is a schematic block diagram of the capacitive orifice flow measuring device of the present invention.
图3是本发明微小电容测量电路原理图。 Fig. 3 is a schematic diagram of the tiny capacitance measuring circuit of the present invention.
图4是本发明的放大器与整流滤波电路原理图。 Fig. 4 is a schematic diagram of the amplifier and rectification filter circuit of the present invention.
图5是本发明跟随器电路原理图。 Fig. 5 is a schematic diagram of a follower circuit of the present invention.
图6是本发明的振荡驱动电路原理图。 Fig. 6 is a schematic diagram of the oscillation driving circuit of the present invention.
图中：1、法兰，2、金属孔板，3、不锈钢螺钉，4、导线，5、金属环，6、绝缘测量管。 In the figure: 1. flange, 2. metal orifice plate, 3. stainless steel screw, 4. wire, 5. metal ring, 6. insulating measuring tube.
具体实施方式 Detailed ways
下面结合附图和实施例对本发明做进一步说明。 The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
本发明包括转换器和电容式孔板传感器；其中： The invention includes a transducer and a capacitive orifice sensor; wherein:
如图2所示，转换器：包括振荡驱动电路、微小电容测量电路、放大器、整流滤波电路、跟随器、430单片机和输出显示电路；振荡驱动电路依次经电容式孔板传感器、放大器、整流滤波电路、跟随器、430单片机与输出显示电路连接；转换器用于对电容式孔板传感器的信号进行处理，并将处理结果转换成实际流量值进行显示。 As shown in Figure 2, the converter: includes an oscillation drive circuit, a small capacitance measurement circuit, an amplifier, a rectification filter circuit, a follower, a 430 single-chip microcomputer and an output display circuit; the oscillation drive circuit is sequentially passed through a capacitive orifice sensor, an amplifier, a rectification filter The circuit, the follower, and the 430 single-chip microcomputer are connected with the output display circuit; the converter is used to process the signal of the capacitive orifice sensor, and convert the processing result into an actual flow value for display.
如图1所示，电容式孔板传感器：包括绝缘测量管6、金属孔板2和金属环5；金属孔板2放置在绝缘测量管6内，绝缘测量管6外套有金属环5，金属孔板2和金属环5组成集总电容Cx，集总电容Cx的一极接振荡驱动电路LM741的第6脚进行激励，另一极接微小电容测量电路，绝缘测量管6的两端面分别用法兰通过各自的绝缘垫片或聚四氯乙烯塑胶片与系统管道相连接。 As shown in Figure 1, the capacitive orifice sensor: includes an insulating measuring tube 6, a metal orifice 2 and a metal ring 5; the metal orifice 2 is placed in the insulating measuring tube 6, and the insulating measuring tube 6 is covered with a metal ring 5, and the metal orifice The orifice plate 2 and the metal ring 5 form a lumped capacitance Cx , one pole of the lumped capacitance Cx is connected to the 6th pin of the oscillating drive circuit LM741 for excitation, the other pole is connected to the micro capacitance measurement circuit, and the two ends of the insulating measuring tube 6 The flanges are respectively connected to the system pipes through their respective insulating gaskets or polytetrachloroethylene plastic sheets.
所述的金属孔板2材质为不锈钢、钛合金等耐腐材料，或孔板表面涂覆耐腐保护层，用不锈钢螺钉垂直固定在绝缘测量管6中，朝向导电液体出口端方向的金属孔板2中心孔边缘为由小变大的锥形孔，绝缘测量管6和金属孔板2之间用阿拉代胶密封，不锈钢螺钉为集总电容Cx的一个电极，从不锈钢螺钉（3）上引出一根导线4，以便进行电路连接。 The metal orifice plate 2 is made of corrosion-resistant materials such as stainless steel and titanium alloy, or the surface of the orifice plate is coated with a corrosion-resistant protective layer, and is vertically fixed in the insulating measuring tube 6 with stainless steel screws, facing the metal hole in the direction of the outlet end of the conductive liquid The edge of the center hole of the plate 2 is a tapered hole that changes from small to large, and the gap between the insulating measuring tube 6 and the metal orifice plate 2 is sealed with arradine glue. The stainless steel screw is an electrode of the lumped capacitance C x , from the stainless steel screw (3) A wire 4 is drawn out for circuit connection.
所述的金属环5位于金属孔板2后的导电液体出口端方向，金属环5套在绝缘测量管6外，金属环5横截面与绝缘测量管6轴线垂直，金属环5为集总电容Cx的另一电极，从金属环上引出一根导线4，以便进行电路连接。 The metal ring 5 is located in the direction of the outlet end of the conductive liquid behind the metal orifice plate 2, the metal ring 5 is set outside the insulating measuring tube 6, the cross section of the metal ring 5 is perpendicular to the axis of the insulating measuring tube 6, and the metal ring 5 is a lumped capacitance The other electrode of Cx leads a wire 4 from the metal ring for circuit connection.
根据物理学原理可知，改变电容传感器两极板间距离d、有效相对面积s或者极间介质常数ε，均可使该电容容量值发生变化。本发明的电容式孔板流量测量方法基于变介质常数型电容传感器的原理。由放置于绝缘测量管内部的金属孔板和与该孔板距离相近的环绕测量管的金属环组成集总电容Cx。当导电液体流经管道中的孔板时，由于孔板的节流作用，使导电液体流速增大。当导电液体流量大小不同时，经过孔板后导电液体的发散程度不同，因而孔板与金属环之间的电介质随流量大小变化而变化。于是，由孔板和金属环组成的集总电容容量大小也就随流量大小变化而变化。那么，所形成的集总电容的容量大小是通过测量管的导电液体的流量的函数。测量装置安装完成后，测量管材料、测量管直径、孔板直径、孔板与金属环相对位置等因素确定。在外界环境温度、外部电压激励等因素不变的情况下，集总电容Cx的大小只是流量q的函数，即：Cx=Cx(q)，利用Cx与流量q之间的函数关系来实现对导电液体流量的精确测量。这就是电容式孔板流量测量方法的理论基础。 According to the principle of physics, changing the distance d between the two plates of the capacitive sensor, the effective relative area s or the dielectric constant ε between the electrodes can change the capacitance value. The capacitive orifice flow measuring method of the present invention is based on the principle of a variable dielectric constant capacitive sensor. The lumped capacitance C x is composed of a metal orifice plate placed inside the insulating measuring tube and a metal ring surrounding the measuring tube at a close distance from the orifice plate. When the conductive liquid flows through the orifice in the pipeline, the flow rate of the conductive liquid increases due to the throttling effect of the orifice. When the flow rate of the conductive liquid is different, the degree of divergence of the conductive liquid after passing through the orifice plate is different, so the dielectric between the orifice plate and the metal ring changes with the change of the flow rate. Therefore, the size of the lumped capacitance composed of the orifice plate and the metal ring also changes with the change of the flow rate. The size of the resulting lumped capacitance is then a function of the flow rate of the conductive liquid through the measuring tube. After the installation of the measuring device is completed, factors such as the material of the measuring tube, the diameter of the measuring tube, the diameter of the orifice plate, and the relative position of the orifice plate and the metal ring are determined. In the case that the external environment temperature, external voltage excitation and other factors remain unchanged, the size of the lumped capacitance C x is only a function of the flow q, that is: C x = C x (q), using the function between C x and the flow q relationship to achieve accurate measurement of the flow of conductive liquids. This is the theoretical basis of capacitive orifice flow measurement method.
如图6所示，振荡驱动电路以放大器LM741为核心，放大器LM741的第6脚输出端经电容式孔板传感器与低功耗放大器LM124的第三路运算放大器OP07-3的第9脚相接。电阻R4端接放大器LM741的第3脚，另一端接地。划线变阻器R3端接放大器LM741的第6脚，另一端接放大器LM741的第3脚。电阻R2电容C2并联，一端接地，另一端接放大器LM741的第2脚。电阻R1电容C1串联，一端接放大器LM741的第6脚，一端接放大器LM741的第2脚。放大器LM741第6脚输出产生一个正弦交流电来驱动微小电容测量电路。 As shown in Figure 6, the oscillating drive circuit uses the amplifier LM741 as the core, and the 6th pin output terminal of the amplifier LM741 is connected to the 9th pin of the third operational amplifier OP07-3 of the low-power amplifier LM124 through a capacitive orifice sensor. . The resistor R4 is connected to the third pin of the amplifier LM741, and the other end is grounded. The dashed rheostat R3 is connected to the sixth pin of the amplifier LM741, and the other end is connected to the third pin of the amplifier LM741. Resistor R2 and capacitor C2 are connected in parallel, one end is grounded, and the other end is connected to the second pin of the amplifier LM741. Resistor R1 and capacitor C1 are connected in series, one end is connected to pin 6 of amplifier LM741, and the other end is connected to pin 2 of amplifier LM741. The 6th pin output of the amplifier LM741 generates a sinusoidal alternating current to drive the tiny capacitance measurement circuit.
如图3所示，所述的微小电容测量电路，以低功耗放大器LM124的第三路运算放大器OP07-3为核心，采用交流激励法，第三路运算放大器OP07-3的第9脚经电容式孔板传感器与放大器LM741的第6脚相接，电阻R9和电容C6并联两端分别接到OP07-3的第9脚和第8脚，第三路运算放大器OP07-3的第8脚与放大器INA101的第10脚相接，第三路运算放大器OP07-3的第10脚接地。微小电容测量电路通过一个频率为f的稳定正弦交流信号Vs(t)进行激励，形成的结果是输出电压Vo(t)与Cx成正比例关系。 As shown in Figure 3, the microcapacitance measurement circuit is based on the third operational amplifier OP07-3 of the low-power amplifier LM124, and adopts the AC excitation method. The ninth pin of the third operational amplifier OP07-3 is The capacitive orifice sensor is connected to the 6th pin of the amplifier LM741, the two ends of the resistor R9 and the capacitor C6 are connected in parallel to the 9th and 8th pins of the OP07-3, and the 8th pin of the third operational amplifier OP07-3 It is connected with the 10th pin of the amplifier INA101, and the 10th pin of the third operational amplifier OP07-3 is grounded. The micro-capacitance measurement circuit is excited by a stable sinusoidal AC signal V s (t) with frequency f, and the resulting output voltage V o (t) is proportional to C x .
如图4所示，放大器与整流滤波电路原理图，放大器INA101对微小电容测量电路的输出电压进行一级放大，放大器INA101的第9脚与正电源相接，放大器INA101的第6脚与负电源相接；正电源与放大器INA101的第9脚，负电源与放大器INA101的第6脚之间分别接一个高频滤波电容。放大器INA101的第1、4脚之间接一个划线变阻器R5来调节放大器的增益，放大器INA101的第10脚为负输入端，放大器INA101的第5脚接地。放大器INA101的第8脚为输出端。整流滤波电路以LM124第一路运算放大器OP07-1为核心，电阻R6一端接放大器INA101的第8脚，电阻R6另一端接运算放大器OP07-1的第3脚，二极管D1、D2反向，一端接运算放大器OP07-1的第2脚，另一端接第一路运算放大器OP07-1的第1脚。第一路运算放大器OP07-1的第1脚通过电阻R7电容C5并联接地。 As shown in Figure 4, the schematic diagram of the amplifier and rectification filter circuit, the amplifier INA101 amplifies the output voltage of the tiny capacitance measurement circuit, the 9th pin of the amplifier INA101 is connected to the positive power supply, and the 6th pin of the amplifier INA101 is connected to the negative power supply Connected; a high-frequency filter capacitor is connected between the positive power supply and the 9th pin of the amplifier INA101, and the negative power supply and the 6th pin of the amplifier INA101. A dash rheostat R5 is connected between the 1st and 4th pins of the amplifier INA101 to adjust the gain of the amplifier, the 10th pin of the amplifier INA101 is the negative input terminal, and the 5th pin of the amplifier INA101 is grounded. The 8th pin of the amplifier INA101 is the output terminal. The rectifier filter circuit is based on the first operational amplifier OP07-1 of LM124. One end of the resistor R6 is connected to the 8th pin of the amplifier INA101, the other end of the resistor R6 is connected to the third pin of the operational amplifier OP07-1, and the diodes D1 and D2 are reversed. Connect to the second pin of the operational amplifier OP07-1, and the other end to the first pin of the first operational amplifier OP07-1. The first pin of the first operational amplifier OP07-1 is connected to the ground in parallel through the resistor R7 and the capacitor C5.
如图5所示，所述的跟随器，以低功耗放大器LM124的第二路运算放大器OP07-2为核心，第二路运算放大器OP07-2的第5脚与第二路运算放大器OP07-2的第1脚相接，第二路运算放大器OP07-2OP07-2的第7脚与430单片机相接，再通过输出显示电路显示输出测量结果。 As shown in Figure 5, the follower is based on the second operational amplifier OP07-2 of the low-power amplifier LM124, and the fifth pin of the second operational amplifier OP07-2 is connected to the second operational amplifier OP07- The 1st pin of 2 is connected, the 7th pin of the second operational amplifier OP07-2OP07-2 is connected with the 430 single-chip microcomputer, and then the output measurement result is displayed through the output display circuit.
所述的430单片机采用msp430f5438，输出显示电路采用12864点阵带汉字液晶模块，放大器LM124是有四路运算放大器OP07的集成芯片。 The 430 single-chip microcomputer adopts msp430f5438, the output display circuit adopts a 12864 dot matrix liquid crystal module with Chinese characters, and the amplifier LM124 is an integrated chip with four operational amplifiers OP07.
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